How about a little magic?
"An Avengers-themed vehicle."
The S.H.I.E.L.D. Emergency Vehicle is a Ground Vehicle in Disney Infinity 2.0. It is a black and grey jeep with a large holding area in the back (where victims of emergencies would normally be kept), red emergency lights on the top and no roof over the driver. It is unlocked by finishing all of Nova's crossover missions in Marvel's The Avengers Play Set.